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Cesium 视锥体绘制，并动态更新朝向
2025-09-21 15:54:44 1958世界杯
方法封装：
/**
* 绘制视锥
* 苹果园dog
*/
export default class {
constructor(viewer, options) {
this.viewer = viewer;
this._position = options.position;
this._orientation = options.orientation;
this._fov = options.fov || 35.0;
this._near = options.near||0.1;
this._far = options.far||20;
this._fill = options.fill || false;
this._closed = options.closed || false;
this._color = options.color || new Cesium.Color(1.0, 0.0, 0.0, 0.2);
this._outlineColor=options.outlineColor||new Cesium.Color(0.0, 0.0, 0.0, 0.5);
this._flat = options.flat || true;
this.update(this._position,this._orientation);
}
update(position, orientation) {
this._position = position;
this._orientation = orientation;
this._add();
}
_add() {
this._clear();
this._addFrustum();
this._addOutline();
}
_clear() {
this._clearFrustum();
this._clearOutline();
}
_addFrustum() {
if (!Cesium.defined(this._position)) {
return;
}
if (!Cesium.defined(this.viewer)) {
return;
}
var scene = this.viewer.scene;
var frustum = new Cesium.PerspectiveFrustum({
fov: Cesium.Math.toRadians(this._fov),
aspectRatio: scene.canvas.clientWidth / scene.canvas.clientHeight,
near: this._near,
far: this._far,
});
this._frustum=frustum;
var frustumGeometry = new Cesium.FrustumGeometry({
frustum: frustum,
origin: this._position,
orientation: this._orientation,
vertexFormat: Cesium.VertexFormat.POSITION_ONLY,
});
var frustumGeometryInstance = new Cesium.GeometryInstance({
geometry: frustumGeometry,
attributes: {
color: Cesium.ColorGeometryInstanceAttribute.fromColor(
this._color
),
},
id: "frustum",
});
this._frustumPrimitive = scene.primitives.add(
new Cesium.Primitive({
geometryInstances: frustumGeometryInstance,
appearance: new Cesium.PerInstanceColorAppearance({
closed: this._closed,
flat: this._flat,
}),
asynchronous:false
})
);
}
调用：（代码有的在其他js模块，比如matrixUtil.js，就不贴了）
//视锥绘制开始
var mCameraHeightThanBottom = modelm.boundingSphere.radius / 1.7;
let mCameraLoc = matrixUtil.localToWorldCartesian3(
worldCoorOrigin,
x - localconfig.x,
y - localconfig.y,
z + mCameraHeightThanBottom - localconfig.z
);
let m2 = Cesium.Transforms.eastNorthUpToFixedFrame(mLoc);
var rotation222 = Cesium.Matrix4.getMatrix3(m2, new Cesium.Matrix3());
Cesium.Matrix3.multiply(
rotation222,
Cesium.Matrix3.fromRotationZ(Cesium.Math.toRadians(angle + 90)),
rotation222
);
Cesium.Matrix3.multiply(
rotation222,
Cesium.Matrix3.fromRotationX(Cesium.Math.PI_OVER_TWO * 0.91),
rotation222
);
var orientation222 = Cesium.Quaternion.fromRotationMatrix(rotation222);
this.drawViewFrustum(mCameraLoc, orientation222);//画
//视锥绘制结束
this.angleHistory = angle; //保存当前角度
modelm.modelMatrix = m;//新模型矩阵，更新模型位置和角度